To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS. Once your installation files have been copied, it's time to install macOS from scratch. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For Intel-based Mac: Press and hold Command + R when you see the Apple Logo or hear the startup chime. For Apple Silicon Mac: Press the power button until you see the startup screen click Options Continue. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Attach the Time Machine hard drive to the Mac. Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. Quit Disk Utility when the process is done. Rename the USB drive as 'MyVolume' and choose APFS or Mac OS Extended as the format, click Erase. Plug an external USB drive (with 16GB min), launch Disk Utility, and select the USB drive, click Erase. Sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer Downgrade macOS (e.g: Downgrade macOS Mojave to High Sierra) 1. You can find out which Mac you have by clicking on the Apple logo in the top-left corner and selecting "About This Mac" to see the name and year of release. If you're not sure what your Mac came with, head to Apple Support and search for your exact model. Your Mac's "earliest" supported version of macOS is the one that it came with. Older versions were written for Intel chips, which use the x86_64 instruction set, while the newer Apple Silicon chips use the ARM instruction set. It's common knowledge that new macOS releases often drop support for older hardware, but the same is true for newer Mac models and older software, too.įor example, you cannot install any version of macOS prior to Big Sur (released in 2020) on a Mac with an Apple Silicon chip, including the M1. It's important to understand that not all versions of macOS (or Mac OS X) work with all hardware configurations. If you do decide to downgrade this will essentially mean backing up your files, wiping your hard drive, reinstalling the system and applications, copy back your data files and hoping they were not irreversibly upgraded to only work with newer versions you can no longer run.While the process is pretty straightforward, getting your hands on older releases of macOS isn't so easy. Very informative Macworld Applejack article. Installing and running Applejack may on its own cure a lot of woes. Focussing on why you were seeing a slowdown might be better, especially if you really think the computer was running faster at some stage with the same operating system. It may not really be the ideal solution in this situation. A computer slowing down and dock disappearing is likely signs of corruption in the system, but that is just files out of order and not a hardware issue.įirst, decide if you really want to downgrade. One person suggesting hard drive is dying doesn't mean it is.
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